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Transient field indicator

  • US 4,825,152 A
  • Filed: 04/22/1986
  • Issued: 04/25/1989
  • Est. Priority Date: 04/22/1986
  • Status: Expired due to Fees
First Claim
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1. In combination, a film and an antenna in energy coupling relationship with said film, said antenna having a geometry to define a gap and being responsive to the presence of a field to concentrate the energy of said field at said gap, said film being responsive to said concentrated energy at said gap to provide an indication thereof;

  • said film being an undeveloped photographic film and said antenna comprising first and second metallic depositions extending along said film and being closely spaced apart from one another in a manner to form a single gap therebetween;

    wherein said field is electric and each of said first and second metallic depositions has a T-shape and the bases of the T-shapes are closely spaced apart to form said gap.

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